KAGRA SCIENTIFIC CONGRESS: COLLABORATORS’ INFORMATION EXCHANGE

2019/08/20

KSC Newsletter
Issue 5

O3 Started
We are in the era of GW detections (almost) every week
LIGO and Virgo started their 3rd Observation Run (O3), April 1. The O3 is planned for 12 months, and since
they recently announced a one-month break in October, O3 will continue by the end of April 2020. According to
the summary 1 as of August 10, LIGO-Livingston and Hanford reach their sensitivity 140 Mpc and 115 Mpc,
respectively, while Virgo reaches 50 Mpc in binary neutron star inspiral range. Three detectors’ duty-cycle are
69.5%, 72.8 %, and 76.3 %, respectively, and the network duty-factor is 42.5% for triple interferometers,
37.2& for double, 16.4% for single, and 3.9% for no-observation.
LIGO/Virgo began public alert system (GraceDB) 2 ; they announced 23 detection candidates for 4 months 20
days, 2 of them may be of binary neutron star mergers, 2 of them may be of binary neutron star-black holemergers, and rest of them may be of binary black hole mergers or terrestrial errors. The detail analysis are in
progress within the LIGO/Virgo collaborations, but we can say definitely that we have entered the era of GW
astronomy.

KAGRA finished all the installations,is trying to ready for observation in 2019!
Our System Engineering Office (SEO) announced the end of installation phase when we started pump-down for
entire vacuum system (April 13) and started cool-down the last test mass (May 2). The period of installation
was only one-month delay from the planned schedule a year ago, and we somehow set up the configuration
with dual-recycling system. KAGRA’s official
announcement so far is to start observationin late 2019, so that we are still working
with our back to the wall. KAGRA will
cerebrate its finishing construction as aceremony and party on October 4 (Friday)
at Toyama. On that day, with spokespersonsof LIGO and Virgo, we plan to sign up our
new MoA (memorandum of agreement)
regarding the joint observation.
After started commissioning, we faced many
troubles. However, we made the first test
run on June 6 in which we locked X-arm with
5.5 hours of 6 hours (duty cycle 94.8 %), then on June 19 we succeeded to lock a dual-recycling short
Michelson interferometer (sDRMI) within 10 seconds (and keep the lock status for couple of minutes). The
current big problem is the unbalanced features of reflected light (absorption/birefringence, polarization), whichis due to the coating and bulks of Sapphire mirrors. Detector groups are discussing a way to resolve theproblems with many ideas, and the final conclusion will be set in the end of August. 🍏
1 https://summary.ligo.org/O3/
2 https://gracedb.ligo.org/superevents/public/O3/

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Directions

2019/08/20

On Our Very Near Future

The board of KSC changes this summer. The past two years we experienced much of transitions of KAGRA fromconstruction phase to real observation phase (though actually we have not yet started). Our organization stylehas been updated, and we are gradually changing our discussion to science-oriented ones.

MoA with LIGO/Virgo
Before starting observation, we have to make MoA (Memorandum of Agreement) with LIGO/Virgo forexchanging observational data and for making scientific progresses. Due to the requirement of the funding
agency of LIGO, all the observation data of h(t) will be released to public after 18 months of analyzing period.
(say, O3a data [April-September 2019] will be in public by April 2021). LV spent two years to agree on thispoint, and our working group of MoA also has decided to follow this rule. The draft was circulated in [kagra
03024][JGW-M1910535], and the KSC board plans to have approval of the collaboration at the face-to-facemeeting in Toyama.

Change of research style
The MoA also define how the joint papers will be realized in detail, so we also need to revise our style along totheirs. For example, data analysis teams should prepare white paper every summer, together with publicationplans for joint researches. Even for short-author analysis, we need to report these progresses in weekly telecon
at each analysis group. The KAGRA data analysis groups are working on this line, and now proposing ouroriginal analysis plans to LV, which will be in the white paper for O3b.
According to the current organization of LIGO and Virgo, KAGRA also need to assign chairpersons of eachanalysis group (and deputy co-chair if necessary) [this style is already ready in KSC Data Analysis Committee],
Program Committee for refereeing publication plans, Joint Review Committee (JRC) for evaluating scientificimpacts of paper drafts. We might need to change our publication policy for such processes.

CPC will be under KSC
The committee of publication control (CPC) is currently under EO. However, concerning the activity of KSC, EO
is planning to move CPC under KSC. The idea will be shown at F2F and be discussed. New CPC is supposed towork also for Joint Editorial Board with LV for approval, coordinate, and reviewing presentation.

New KSC board & new EO this summer
This year is for exchanging the board of KSC. At the KSC telecon July 5, the rules for KSC election was revised.
We will select four board members by vote; two from data analysis and theory, and two from experimentcategory [JGW-M1706956]. We’ve heard five and four candidacies in each category respectively, and now in thevoting period for KSC members [kagra 03029]. The ballots will be opened in the first day of the F2F meeting.
With three regional representatives, one student, one postdoc, and one EO, total 10 members will work for new
KSC board.
EO also decided to enhance members adding four regional (non-Japanese institutions) representatives thissummer.

Observation ShiftWe all are supposed to help observation shift. We collected shift-candidate list, and now the list has 260
colleague names. Suppose to have 5 months of observation with 8 hours (3 shifts a day) with expert and nonexperts, everyone is expected to appear 3-4 days at the KAGRA site for monitoring and checking the status of
the detectors at the site.
Hisaaki Shinkai 🍏

Whew! Let’s enjoy our busy days a bit more.

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2019/08/20

Collaboration

Observing Scenario Paper
Submission of the updated version of Observing
Scenario Paper [Living Rev. Relativ. (2018) 21:3](https://doi.org/10.1007/s41114-018-0012-9) has
been postponed. However, a short summary has beenreleased in public at: https://dcc.ligo.org/LIGOP1900218/public in order to facilitate proposals byastronomers for observing time we present ourcurrent best estimate of the plausible observing
scenarios for the Advanced LIGO, Advanced Virgoand KAGRA gravitational-wave detectors over the
next several years. [JGW-P1808427][kagra 03030]
Particularly, Figure 2 (above right) shows the official and updated version of planned sensitivity
evolution and observing runs over the coming years including the O5 upgrades.

Sadakazu Haino 🍏

Author-list 2018 is fixed
The author-list committee (Yosuke Itoh (Chair), Yoichi
Aso, Kazuhiro Hayama, Feng-Li Lin, John J. Oh, andTakashi Uchiyama) finalized the list. In February, we
called applicants who had made contribution to KAGRA
more than 30% of each research time in 2018. The
number of the applicants were 226. After anonymousreferees (at least two referees for each) checked one’s
activities (and applicants had chances to respond tothem), the committee summarized the author-list of 200
collaborators [JGW-P1910338].

Collaboration statistics
This year, we asked all KAGRA collaborators
to file signed “O3 commitment form” inorder to treat confidential observational
facts. We also asked each institutions tosign up “Collaboration MoU” in order for
confirming the collaborative works ofobservation and also for future upgrades.
We also asked group leaders to file the list of
shift candidates and check who are KSC
members.
The board appreciate your reactions. All thestatistics are summarized in the table left.

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2019/08/20

OutreachPublic talk at Kamioka Lab, June 2 by Takaaki Yokozawa「重⼒波とニュートリノの同時観測?! 超新星爆発の謎に迫る」
On Sunday, June 2, ICRR’s project assistant professor Takaaki Yokozawa gave a public event talk entitled“Simultaneous observation of gravitational waves and neutrinos?! Approaching the mystery of supernova
explosion” at KamiokaLab, science
museum in Kamioka town.
D r. Yo k o z a w a c o n v e y e d h i s
expectations to observe gravitational
waves and neutrinos from supernova
explosion simultaneously with two
underground telescopes in Kamioka
while mixing stories about his
researcher life in Super-Kamiokande
and KAGRA experiments. The event
was reported in news of a local
television (NHK Gifu) and a local
newspaper (Gifu Shimbun).

Photo courtesy of KamiokaLab

See https://www.gifu-np.co.jp/news/20190604/20190604-144033.html for web article of Gifu Newspaper.
KamiokaLab’s blog also reports about the talk event. https://www.city.hida.gifu.jp/site/kamiokalab/13457.html

Public talk at Kamioka town, June 16 by Keiko Kokeyama「地下望遠鏡・KAGRAではじめる重⼒波天⽂学」
On Saturday, June 13, ICRR’s Assistant Professor, Keiko Kokeyama gave a public lecture entitled “Gravitational wave
astronomy begin with KAGRA underground telescope” at the public hall of Kamioka town. This lecture is a part of
Kamioka town’s event “Geo Space Adventure (GSA),” which thousands of visitors from all over Japan explore
underground facilities and mine tunnel. While KAGRA cannot accommodate such big number of visitors, KAGRA is
asked to give a lecture instead. Hundreds of audience heard her lecture in fascination and in the Q&A session,
pitched plenty of interesting questions.
“I was quite interested
in the story thatgravitational waves
warp the space andtime,” Mr. Takuto Endo,a high school student
attending GSA with hisfamily from Shizuoka
prefecture, told as animpression of thelecture. He continued“In a future, if we will be able to control the emission ofgravitational waves, we may realize a time machine.”

Yoshihisa Obayashi 🍏

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2019/08/20

Global Outreach
Forum lecture in Washington DC, June 7 by Takayuki Tomaru
On Friday, June 7th, NAOJ’s professor Takayuki Tomaru presented about gravitational wave observation of KAGRA
in the 24th “Science in Japan” Forum, held in Cosmos Club in Washington DC, USA. The series of “Science in Japan”
Forum has been held annually on variety of themes since Dr. Masatoshi Koshiba inaugurated the series when he was
the director of JSPS Washington office. The theme of this time was “New Eyes on the Universe.” The audience
ranging from students to government officers listened to the forum programs started from our PI, Professor Kajita’s
message followed by gravitational waves and high-energy cosmic ray talks and discussion session on new astronomy.
Report on the forum will be posted on JSPS Washington office webpage soon: https://jspsusa.org/wp/sijforum/.

KAGRA is propagating to the world
As the date of KAGRA’s observation start is approaching,a number of science TV crews and science magazine
photographers from Japan and oversea visit KAGRA toshoot KAGRA’s instruments and interview researchers.
Bunch of KAGRA reports on worldwide media is
expected to appear soon.
The U.Tokyo’s international
public relations team also
visited KAGRA and publishedan article for foreign readersin UTokyo Focus webpage:https://www.u-tokyo.ac.jp/
focus/en/features/z0508_00111.html
as well as lovely designed printed version.

Yoshihisa Obayashi 🍏

Cover page of the printed version of UTokyo Focus’s article on KAGRAColumnS-study and Y-study

It is often said that the English names for studies are mainly categorized into the one ends with Y(e.g. astronomy, biology), and the one ends with S (e.g. physics, mathematics, genetics). The formers are
the study of detection, collection of data, and classification of them. The latters are the study of reduction
and systemization, which intend to explain the nature with minimum assumptions and laws . (I heard
this classification from my postdoc adviser, Toshikazu Ebisuzaki. He says he knew this classification in thelecture by Keiichi Kodaira, an astronomer.)
Look back to the history, the normal studies followed the stream that first Y-study collects thedata, then S-study explains the background and finalized with a theory or law. As you know, like the
Newtonian physics, the quantum physics, ...
The theory of relativity, however, the order is reverse; from S to Y. That is, the theory is always
advanced, and astronomers have been following the prediction of the theory. The most of the current
theoretical physics are far advanced from experiments and observations, and such origin can be reachedat the era of Albert Einstein. When we work on blackholes, cosmology, and gravitational waves, we arealways struck with awe of Einstein.
(A part of the article, Theories of blackhole and their around, Hisaaki Shinkai)

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Next F2F

2019/08/20

Face-to-Face 23 at U. Toyama, August 22-24

Program: http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/LCGT/Meeting/f2f/2019August
We will come and meet together in Toyama, as the normal summer event. Our preparation for joining O3 will be
the main topic of this Face-to-Face meeting, Especially, we need to approve our directions as the draft of MoA, and to
set up the observation-shift system for O3. The future-planning committee organizes their satellite meeting on
August 21 at Univ. Toyama, and they try to finalize KAGRA white paper for future upgrade.
This year is for exchanging the board of KSC. We will select four board members by vote; two from data analysis
and theory, and two from experiment category. We are now in the voting period for KSC members. The ballots will be
opened in the first day of the F2F meeting.
The registration was already closed, and the number of participants is already 137 (37 from outside of Japan),which is the largest registration ever. Toyama City will provide us financial support for our meeting dinner, so that wewill enjoy FREE meal (aka banquet) again. On August 21 and 24, KAGRA site tours are organized; 33 colleagues willvisit the site. 🍏Previous F2F

Face-to-Face 22 at ICRR, April 19-21

Program: http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/LCGT/Meeting/f2f/2019Apr
The 22nd F2F meeting was held at Institute of Cosmic Ray Research, the University of Tokyo; KAGRA’s main hostinstitute. We had 138 participants, the largest number ever. The invited speaker was Hiroaki Yamamoto from LIGO.
Three satellite meetings was held; satellite meeting on future upgrades (April 18, at U. Tokyo Hongo campus), on
data analysis (evening of Apr 19), and on calibration and related grants projects (Apr 22). Quite tight schedule.
Two new institutes joined to the collaboration; National Chiao-Tung Univ. (Yi Yang), and National Astronomical
Observatories of China (Hong-Bo Jin).
We thank LOC, Hideyuki Tagoshi, and ICRR members. 🍏

KAGRA MEETING SCHEDULE
Mark your calendar now for the following meetings.
The 23rd KAGRA Face-to-Face meeting at U. Toyama, August 22-24, 2019.
The 24th KAGRA Face-to-Face meeting at U. Tokyo, RESCEU, December 4-5, 2019.
The 25th KAGRA Face-to-Face meeting at somewhere, Spring, 2020.
call for a host univ./institutes
The 7th KAGRA International Workshop, at National
date fixedCentral U., Taoyuan City, Taiwan, May 29-31, 2020

OTHER RELATED GW MEETINGS
Check out http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/KSC/O3#Schedule for KAGRA related one
or more generally https://wiki.ligo.org/LSC/UpcomingConferencesAndMeetings(Please check them before you plan to organize a meeting, in order not to conflict the schedule.)

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Previous KIW

2019/08/20

The 6th KAGRA International Workshop,
June 21-23, 2019, Wuhan, China
http://kiw6.csp.escience.cn/

The 6th KAGRA International Workshop (KIW6) was organized by Wuhan Institute of Physics andMathematics (WIPM), Chinese Academy of Sciences in June 2019. We had more than hundred participants, andhad quite dense discussion for three days, including the introduction of ZAIGA (Zhaoshan long-baseline AtomInterferometer Gravitation Antenna), and space-borne GW projects. Jenne Driggers from LIGO Hanford made apublic talk in the first evening for young generation. In the second day, the diversity tour was organized and we
enjoyed walk and cycle-ride at the Wuhan East Lake. We definitely broaden our connections for promoting
science.

We really appreciate the LOC
members: Wei-Tou Ni, MingshengZhan, and other staffs and studentsof Wuhan Institute of Physics andMathematics (WIPM), Chinese
Academy of Sciences.
I should confess that I had never
drunk so much in my life as thebanquet of KIW6. 😂
Hisaaki Shinkai 🍏7

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2019/08/20

Poster Award Winners”Most Outstanding Presentation Prize” for two
At the face-to-face meeting ICRR April 2019, we awarded Mr. Yuhang
Zhao and Mr. Koji Nagano. (Two received a certification signed by Kajitasan. H.Shinkai donated his new book as the winner's prize.)
Here are the abstracts of the winner's presentations.

Yuhang Zhao (NAOJ)
Status of frequency dependent squeezing experiment at TAMA
In the current and future generation of gravitational wave detectors,
quantum noise will be one of the main limiting noise. Frequency
dependent squeezing was proposed to achieve broadband quantum noise
reduction. It can be realized by the combination of frequency independent
squeezing and detuned Fabry-Perot cavity, usually addressed as filter
cavity. A cavity length of 300m was proven to be optimal in terms ofround trip loss per meter and detector's sensitivity improvement.
At NAOJ, we are testing the production of frequency dependent
squeezing, by using one 300m arm of former TAMA detector as a filter
cavity. We have already integrated and locked the cavity and we set up afrequency independent squeezing source in the central area of TAMA. Up
to now, we have achieved 3dB of squeezing and 18dB of anti-squeezing
above 50 kHz. We are currently working to improve the frequency
independent squeezing performance and preparing the injection of thesqueezing into the filter cavity. 🍏

Koji Nagano (ICRR, U. Tokyo)
Axion Dark Matter Search with Interferometric Gravitational
Wave Detectors
Axion dark matter differentiates the phase velocities of the circularpolarized photons. Recently, we proposed a scheme to measure the phasedifference by using a linear optical cavity (arXiv:1903.02017).
Figure shows the shot-noise limited sensitivity to the axion-photon coupling
constant, ga , of the Fabry-Perot arm of KAGRA, DECIGO, and Cosmic
Explorer, to which our scheme is applied.
All detectors can improve the upper limit provided by CAST. KAGRA canovercome the CAST limit by one order of magnitude in broad axion mass
range around between 1 ⇥ 10 14 and 3 ⇥ 10 10 eV. At the most sensitiveaxion mass m = 2.084 ⇥ 10 10 eV, the improvement from CAST limits isabout 4 orders of magnitude. Remarkably, our new scheme for axion dark
matter search can coexist with observation run for gravitational waves ofthe detectors. We expect that this scheme becomes a new approach tosearch for axion dark matter. Shall we carve out the future of axion dark
matter search with KAGRA? 🍏<latexit sha1_base64="ie4ZNfcvtVB8tkjvrQNQbKbTouk=">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</latexit><latexit sha1_base64="mNXsf9/oEX+qqAI72D0RsqPQ/0w=">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</latexit><latexit sha1_base64="6FkSGUa9Bd39kY0lFwMUAQg15Yg=">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</latexit><latexit sha1_base64="MtvsCSDGxJp7dAyw042yIGS7Ma4=">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</latexit>

Sensitivity comparison of some parameter sets. Although the higher mass range
seems to be filled, they have sensitivity peaks at axion mass of!m = N ⇡/L (N 2 N, and L is cavity length). The gray band expresses the parameter<latexit sha1_base64="TRnjRCq7fFXRhgji/QDvrNYJyDw=">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</latexit>

region excluded by CAST.

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Newly Joined

National Chiao Tung University
Yi Yang
It is our great pleasure to join KAGRA Collaboration in the last face-to-face meeting held at
Institute of Cosmic Ray Research (ICRR), University of Tokyo at Kashiwa. Through the abundant discussion
with the KAGRA members, we learned a lot about the KAGRA construction, data analysis, O3 collaboration, etc.
Hopefully we will make our own contribution to KAGRA soon.
National Chiao Tung University (NCTU) was founded in 1896 in Shanghai, and moved to Hsinchu, Taiwan
in 1958. NCTU is one of the top research funded universities in Taiwan, especially in science, engineer andcomputer. NCTU comprises 12 colleges in 6 campus. There are around 15,000 students including 800+international students, and about 900 faculty. The Electrophysics department was established in 1964, one of
the first two departments founded in NCTU. Currently, there are about 40 faculty, 268 UnderGrad students, 163
Master students and 89 PhD students. The high energy theoretical group focuses on the topics of string
amplitudes, holographic correspondence, QFT, cosmology, gravitational wave, black hole physics, mathematic
physics, etc.
Yi Yang received his PhD degree in2003 from the Dept. of Physics at
Simon Fraser University, Canada. Afterseveral years’ experience of postdoc
and researcher, he joined the faculty of
the Dept. of Electrophysics at NCTU in
2008. Yi Yang has worked on various
topics of high energy physics. He has
published more than 50 journal papers
on holographic correspondence, blackhole physics and string theory etc.
Recently, Yi Yang started to beinterested in gravitational wave physics
and finished a paper, Imprints of Early
Universe on Gravitational Waves from First-Order Phase Transition in QCD, to study the gravitational wave
generated by the confinement-deconfinement phase transition in QCD during the early universe expansion.
There are several other members in our group. Sheng-Hong Lai received his PhD degree in 2018 from theDept. of Electrophysics at NCTU, and became a postdoc in our group. Chia-Jui Chou, En-Jui Chang and Hans
Lao are PhD students in our group. Chia-Jui Chou will finish his PhD program this year and become a postdoc
in our group from Feb. 2020. Meng-Wai Li is the assistant researcher and Yi-Hsuan Huang is a master student inour group. In addition, we have three 4th year UnderGrad students (Yu-Hsuan Lo, Pin-Chi Liao and Po-Jung Lu)
in our group. One of them, Yu-Hsuan Lo, will enter the PhD program and stay in our group.
Our current research interests include three directions. One is to test the violation of GR from thegravitation wave data by using the Bayesian method. We have begun to collaborate with Feng-Li Lin, who is the
KAGRA member in NTNU (Taiwan) and Tjonnie Li, who is the KAGRA member in CUHK (HongKon) and thechair of the Testing GR project in LIGO. So far we are focusing on the topics of Test infrastructure of GR,
Lorentz Invariance Violation Test, No Hair Theorem Test and Template-based or Morphology-Independent
Echoes Search. The other direction is the rapid detection and the parameters estimation of the gravitational
wave by using the stratagem of deep learning. The third direction is the theoretical research on gravitational
waves. We will continue our study in the gravitational wave generated during the universe expansion, andstudy the equation of the state of the compact stars.
During the next years, we aim to bring up some young researches on gravitational physics in Taiwan andhopefully to make important contributes in the long term perspective.🍏

9

KAGRA Scientific Congress Newsletter No. 5

2019/08/20

Newly Joined

National Astronomical Observatories,
Chinese Academy of Sciences
Youjun Lu
It was our great pleasure that we joined the KAGRA collaboration at the 22nd KAGRA face-to-face meeting
held at ICRR on April 18-21, 2019. In that meeting, we interacted with KAGRA colleagues and exchanged views
and ideas with them on multi-messenger astronomy and GW related astrophysics. We are looking forward forcollaborations and hoping to make contributions to KAGRA soon.
We would like to first introduce our institute, National Astronomical Observatories of China (NAOC), as a
new member of KAGRA. NAOC is one of the major institutes supported by Chinese Academy of Sciences. NAOC
conducts cutting-edge astronomical studies, operates major national facilities (including the well known
LAMOST and FAST), and develops the state-of the-art technological innovations. NAOC has now about 500
faculty members, 30 postdocs, and 300 graduate students. In NAOC, there are a number of research groups
working on GW related astrophysics and multi-messenger astronomy, including: (1) searching for electromagnetic counterparts of GW sources; (2) stellar mass compact binary coalescence and their astrophysicalorigin; (3) space GW facility such as Taiji; and (4) pulsar timing array experiments to detect nano-Hertz GWemission from massive binary black holes. Our group, the gravitational wave astrophysics research group, is oneof these groups, and is mainly working on the GW related astrophysics studies.
This time, four faculty members and five students have joined the KAGRA from NAOC (all from thegravitational wave astrophysics research group): Youjun LU (group leader); Hongbo JIN (associate professor);
Changshuo YAN (associate professor); Junqiang GE (Research associate); Di LU (student); Yuetong ZHAO
(student); Qingbo CHU (student); Xiao GUO (student); Hao MA (student). We have been working on theformation and evolution of stellar mass compact binaries and their contribution to the GW background in both
high- and low-frequency band (from 10-4 to 1000Hz). We plan to use the observational data of KAGRA O3-O4
to obtain statistical information on the properties of GW sources, such as the mass and spin distributions ofbinary black hole mergers, the mass and host galaxy property distributions of double neutron stars. By
combining such information with cosmological formation models for binary black holes and double neutronstars, we aim at obtaining strong constraints on the physical processes involved in the formation models. GW
observation data has all kinds of noise, which disturb the matching between the GW observations with the GW
templates. LIGO has released more than ten GW sources, of which the identification and physical parameter
extraction depend on the data analysis. We have been working on the data analysis method and will continue todevelop software, based on our methods. We attempt to construct models to describe the noise sources in the
GW observation data, which may help in searching of the stochastic GW background. We plan to use the
KAGRA O3-O4 observations to constrain the GW stochastic background. We also plan to investigate the abilityof constraining cosmological parameters
by using those GW sources with andwithout redshift measurements. With theoperation of KAGRA and several otherfuture GW detectors under plan, manybinary black hole mergers with better
localizations are expected, which may
improve the constraint on cosmologicalparameters.
We have had a meeting with Prof.
Takaaki Kajita, ICRR director, during his
visit to NAOC on June 11, 2019, on our
joining the KAGRA and possible futurecollaboration between NAOC and KAGRA.
After that meeting, our group members took a photo with Prof. Kajita as the souvenir of the collaboration
between the NAOC and ICRR. 🍏

10

KAGRA Scientific Congress Newsletter No. 5

Report2019/08/20

Life in Cambridge and Boston
Kentaro Komori (MIT, US)

I am working on a filter cavity experiment in LIGO MIT as a JSPS
overseas research fellow after graduating from Ando laboratory in
University of Tokyo. Here I write a memoir in Cambridge and Boston.
Three years ago, I used to come to LIGO MIT as a visiting student. That
visit was a lot of fun and a great experience, which resulted in myapplication to JSPS overseas research fellowships. Fortunately, theapplication was accepted while I intended to draw a lot, and decided togo back.
A couple of tens people work in LIGO MIT, and mainly they doexperimental and data analysis researches. Experiments in thislaboratory aim at measurement and demonstration of advanced
techniques for gravitational wave detectors, such as precise evaluationof coating thermal noise, optomechanical squeezing with a cantilever,
and a 16-m filter cavity for frequency-dependent squeezing. The filter
cavity is put in huge vacuum chambers amazing me at the size. With
regards to details of the experiment, please look forward to my talk in
the coming F2F meeting.

My first impression on LIGO MIT is the high-levelresearch and activity as you thought. I feel accumulationof efforts for over a half century, and researchers are thecase. Many people hired by MIT or LIGO come from allover the world. Some members have a title of “researchscientist”, who is majority as well as postdocs. Moreover,postdoc candidates are awesome. Sometimes a postdoc
job interview is held with a weekly meeting, and thecandidates are active researchers who wrote famous
papers (the first broadband measurement of quantum
radiation pressure noise, the first ground state coolingwith feedback control, etc). The postdoc position is toocompetitive for me to be hired by LIGO and there would
be no chance to come here if it were not for the JSPS
overseas fellowship system, so I appreciate it.
As for my daily life, I enjoy swimming in a huge and deep
pool a few times once a week, playing Ping-Pong withcolleagues in office building(!), and playing sailing at
Charles river. Also, I often walk around Cambridge where
there are MIT and Harvard University and Boston city. My
favorite place is walking areas along Charles river withthe spectacular view.
In summary, I feel it is a really nice opportunity to work in
MIT with a lot of valuable experiences which would neverbe gained in Japan. I hope coming back to Japan after
this precious training. 🍏

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KAGRA Scientific Congress Newsletter No. 5

Awarded2019/08/20

The Sudang Prize for Hyung Mok Lee

Samyang Foundation in Korea announced three winners of the 28th Sudang Prize,
including KAGRA’s collaborator Professor Hyung Mok Lee at Korea Astronomy andSpace Science Institute (KASI). The award ceremony was held at the Lotte Hotel in
Sogong-dong, Seoul on May 9 and a prize of 100 million won was given to eachwinner.
The Samyang Group’s web page notes the Prizes are presented to individuals who
have made exemplary contributions in basic sciences, applied sciences andhumanities & social sciences categories. Professor Hyung Mok Lee leads Korean
Gravitational Wave Group (KGWG) which is a member of both KAGRA and LIGO
Scientific Collaboration. Financial News in Korea says Lee’s outstanding researchachievements in various fields of astronomy, especially the contribution to the firstdetection of gravitational wave in 2015, are highly regarded. Congratulations!
http://www.samyang.com/eng/Contribute/sudanggrouphttp://www.fnnews.com/news/201905091007320874
Photo from Financial News in Korea
http://www.fnnews.com/news/201904101349208742

Awarded

IUPAP-TIFR Homi Bhabha Medal for Takaaki Kajita
The 5th IUPAP-TIFR Homi Bhabha Medal and Prize was given to Takaaki Kajita,
Institute for Cosmic Ray Research, University of Tokyo, Japan. This prize wasestablished by the International Union of Pure and Applied Physics (IUPAP) and theTata Institute of Fundamental Research (TIFR), Mumbai, India in 2010 to honor Dr.
Homi Jehangir Bhabha, a cosmic ray physicist well-known for the Bhabha-Heitlercascade theory and relativistic positron-electron scattering also known as Bhabha
scattering.
The award citation and medal were presented to Prof. Kajita during the inaugural
function of the 36th International Cosmic Ray Conference in Madison, WI, USA on
25 July 2019. Congratulations!
http://grapes-3.tifr.res.in/homibhabhaaward.html

Photo from the award website
AwardedStudent Presentation Award of JPS
for Yutaro Enomoto
Yutaro Enomoto (U. Tokyo) was awarded the Student Presentation Award of the
Physical Society of Japan in the annual meeting 2019 March, for his talk on "Maininterferometer control of the Large-Scale Cryogenic Gravitational Wave Telescope
KAGRA”. Congratulations!
https://www.jps.or.jp/activities/awards/gakusei/2019a-student-presentationaward.php

Photo from Yuta Michimura
12

KAGRA Scientific Congress Newsletter No. 5

Links

2019/08/20

How much are you ready for O3?

When you reveal yourself that you are working on gravitational wave, then people will get excited (hopefully)
and ask you what are the latest results which are not known in public. The expected answers are something like
“Yeah, of course. I heard a new event candidate last night”, “Well, now in this moment, both LIGO and Virgo
are down for maintenance.”,etc.

[Please note that the official answer is: “If you join to the KAGRA

collaboration, then I will let you know any confidential matters”.]

The event alerting system
LIGO and Virgo provide open alert system for followup astronomers, which we are supposed to join when
we begin observation. The user guide is available(https://emfollow.docs.ligo.org/userguide/), with EM
follow up tutorial (https://dcc.ligo.org/public/0118/
G1500442/010/ligo-virgo-emfollowup-tutorial.html).

These page suggest to subscribe mailing list for alerts( h t t p s : / / e m f o l l o w. d o c s . l i g o . o r g / u s e r g u i d e /quickstart.html) or to check out GraceDB[Gravitational-Wave Candidate Event Database] (https://gracedb.ligo.org/), where you can find the list of
event candidates since April 1, 2019.
iOS application
If you are lazy enough to check such information regularly, thenthere is an iOS application, Gravitational Wave Events, (https://apps.apple.com/app/id1441897107), which notices you when an

event detected.
The status of LIGO/Virgo/KAGRA monitoring
system
If you want to know the status of LVK detectors at thismoment, check out GW detector network, (https://ldasjobs.ligo.caltech.edu /~gwistat /gwistat /gwistat.html), or
https://monitor.ligo.org/gwstatus. You will feel guilty if

KAGRA is off.
The actual data for research
For your research purpose, LV provide data-releasing website as
GW Open Science Center (https://www.gw-openscience.org). There you can find both O1 (https://www.gwopenscience.org/O1/) and O2 (https://www.gw-openscience.org/O2/). Data of O3? If you filed “O3commitment form” and have an account to KAGRA main data server, you can access them. KAGRA data
managing group receives LV data every second, and they began stock them for engineering purpose from July
31. (KAGRA is not allowed to make use these data for scientific purpose before we have MoA with LIGO/Virgo).
All such information is in our wiki and maintained regularly. You need to bookmark only the page
http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/KSC/O3#Links

Good luck.

🍏
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KAGRA Scientific Congress Newsletter No. 5

2019/08/20

WE FOUND THAT …
Mariko Takahashi, a journalist, wrote an article in Ronza web (論座) titled, “続々見つかる重力波、高まる
KAGRAへの期待” (Gravitational Wave was detected one after another: Rising expectation to KAGRA).
https://webronza.asahi.com/science/articles/2019052300007.html

KAGRA COLLABORATION ARTICLESFirst cryogenic test operation of underground km-scale gravitational-wave observatory KAGRA
T. Akutsu et al. (KAGRA Collaboration, author-list 2016+2017)Classical and Quantum Gravity 36 (2019) 165008 [JGW-P1809289] [arXiv:1901.03569]
https://iopscience.iop.org/article/10.1088/1361-6382/ab28a9
Application of the independent component analysis to the iKAGRA data
T. Akutsu et al. (KAGRA Collaboration, author-list 2015+2018), submitted to PTEP
[arXiv:1908.03013] https://arxiv.org/abs/1908.03013[JGW-P1910218] https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=10218
A public book, Gravitational Wave (The Last Gift of Albert Einstein)
originally by John J. Oh in Korean was translated into Chinese andreleased from Posts and Telecom Press, 180 pages, $19.99.
ISBN-978-7115504036
https://www.amazon.com/Gravitational-Wave-Albert-Einstein-Chinese/
dp/7115504032/
The original version: ISBN- 9788962621310
https://www.aladin.co.kr/shop/wproduct.aspx?ItemId=74920520

The Asakura Publishing Co. announced that “Encyclopedia of Relativity and the Universe” (相対論と宇宙の事典）will
be published in November 2019. The one of the main editors is Masaki Ando, and many KAGRA collaborators were
contributed as volunteers. 448 pages in A5 size, 10000yen + Tax. ISBN978-4-254-13128-4
http://www.asakura.co.jp/books/isbn/978-4-254-13128-4/
The magazine “Bungei-Shunjyu”,(Bungei-Shunjyu Publishing Co.)
features The Era of Reiwa futurechronological table in their June2019 issue. Takaaki Kajita
contributed an article, titled “Theplan of science-and-technology
nation will collapse if this continues”.

The magazine “Gendai-Shisou”,
means “Contemporary Ideology”,(Seido Publishing Co.) features
Einstein in their August 2019 issue.
Hisaaki Shinkai contributed anarticle, titled “Theories of blackholes and their around”.

RECENT KAGRA STATUS TALKS
meeting/conferences

speaker

JGWdoc

KIW6 in Wuhan, China

June 2019

Takaaki Yokozawa[JGW-G1910225]

GR22/Amaldi 13, Valencia, Spain

July 2019

Hisaaki Shinkai[JGW-G1910410]

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KAGRA Scientific Congress Newsletter No. 5

2019/08/20
Meng-Wei Li(PhD student)
Yi-Hsuan Huang (Graduate Student)
Yu-Hsuan Lo(Graduate Student)
Pin-Chi Liao
(UnderGrad Student)
Jiou-Cing Liao (UnderGrad Student)
Po-Jung Lu(UnderGrad Student)
National Taiwan Normal University
Ting-Wai Chiu (Professor)
Osaka City University
Kazumasa Okabayashi (Graduate Student)
Kazuma Takahashi(Graduate Student)
Peking University, Kavli Institute for Astronomy andAstrophysics
Junjie Zhao
(Graduate Student)
Shanghai Astronomical Observatory, Chinese
Academy of Sciences
Chengkai Wan (Graduate Student)
Shuo Xin(Graduate Student)
Qianyun Yun(Graduate Student)
Xinyu Zhong(Graduate Student)
Shucheng Yang (PhD student)
Chen Zhang(PhD student)
Tamkang University
Kin-Wang Ng (Research Fellow)
Parisi Alessandro (Postdoc)
Tsinghua University
Zhongda Yuan (Senior Engineer)
Zeqing Xiao
(Postdoc)
University of Notre Dame
In-Saeng Suh (Associate Professor)
University of Toyama
Takuro Nishio (Graduate Student)
Kanta Hattori (Undergrad Student)
Yota Nakayama (Undergrad Student)
Shun Nozaki(Undergrad Student)
Kanta Yamashita (Undergrad Student)
Wuhan University
Gang Yu(Assistant Professor)
Quan Cheng (Postdoc)
Shaoqi Hou(Postdoc)
Pengbo Li(PhD student)
Zhiqiang You (Graduate Student)
Dongze Sun(Undergrad Student)
April 16—July 31, 2019

New Collaborators (*= New Groups)
Aoyama Gakuin University
Misako Noguchi (Graduate Student)
Shuto Sei
(Graduate Student)
Kento Aihara (UnderGrad Student)
Shotaro Ide(UnderGrad Student)
Kazuki Mita
(UnderGrad Student)
Yoshihiro Okutani (UnderGrad Student)
Yuri Sato(UnderGrad Student)
Kazuyoshi Tanaka (UnderGrad Student)
Beijing Normal University
Ping Guo(Professor)
He Wang(Graduate Student)
Chungnam National University
Kwangmin Oh (Graduate Student)
Hirosaki University
Naoya Era
(Graduate Student)
Yuki Hagihara (Graduate Student)
Daisuke Iikawa (Graduate Student)
Kavli Institute for the Physics and Mathematics of the
Universe (IPMU)
Shi Pi(Postdoc)
Nagaoka University of Technology
Saki Kobayashi (UnderGrad Student)
National Astronomical Observatories, Chinese
Academy of Sciences *Youjun Lu(Professor)
Hong-Bo Jin(Associate Professor)
Chang-Shuo Yan (Associate Professor)
Junqiang Ge (Assistant Professor)
Qingbo Chu(Graduate Student)
Xiao Guo(Graduate Student)
Di Lu(Graduate Student)
Hao Ma(Graduate Student)
Yuetong Zhao (Graduate Student)
National Central University
Wu-Cheng Chiang
National Chiao Tung University *Yi Yang(Professor)
Sheng-Hong Lai (Postdoc)
En-Jui Chang (PhD student)
Chia-Jui Chou (PhD student)
Hans Brynner Lao (PhD student)

Collaboration-list committee made their mailing address kagraros@icrr.u-tokyo.ac.jp; ros from a roster.
If your affiliation address (or email) changes: Contact to kagraros@icrr.u-tokyo.ac.jp
If your group has new members: Contact to kagraros@icrr.u-tokyo.ac.jp
If you have a nice photo: Let the KSC Newsletter share them.
If you are planning to join KAGRA collaboration as a new group: Contact to kscboard@icrr.u-tokyo.ac.jp

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KAGRA Scientific Congress Newsletter No. 5

2019/08/20

WE HEAR THAT …
Osamu Miyakawa (ICRR) became an associate professor at ICRR, April 2019.
Takaaki Yokozawa (ICRR) became a project assistant professor at ICRR, May 2019.
Mark Barton moved to University of Glasgow as a Senior Research Fellow from NAOJ, June 30, 2019.
Yutaro Enomoto (U. Tokyo) was awarded the Student Presentation Award of the Physical Society ofJapan in the annual meeting 2019 March. (see p11).
Hyung Mok Lee (KASI) was awarded the 28th Sudang Prize from the Samyang Foundation in Korea.
(see p11).
Takaaki Kajita (ICRR) was awarded the 5th IUPAP-TIFR Homi Bhabha Medal from the International Union
of Pure and Applied Physics (IUPAP) and the Tata Institute of Fundamental Research (TIFR). (see p11).
Congratulations! If you have other news, please notice them to the editors.

KSC board From Aug. 2018 to Aug. 2019
Thanks for your cooperations, supports, & suggestions.
Zong-Hong Zhu (BNU, China region)
Hyung-Won Lee (Inje U, Korea region)
Ray-Kuang Lee (NTHU, Taiwan region)
Takahiro Yamamoto (ICRR, post-doc)
Koji Nagano (ICRR, student)

Hisaaki Shinkai (OIT, chair)
Chunglee Kim (Ewha Womans U, vice chair)
Sadakazu Haino (Academia Sinica)
Yuta Michimura (U Tokyo)
Nobuyuki Kanda (OCU, EO)

FROM EDITORS

designed configuration

We appreciate many contributors again for this issue.
We are always calling editorial volunteers, and we also want yourposts and/or leaks of information.

(future plan)y-arm

Please send your inquiries the current editorial staff.
Hisaaki Shinkai (Osaka Inst. Tech. ). hisaaki.shinkai at oit.ac.jp
Ayaka Shoda (NAOJ) ayaka.shoda at nao.ac.jp
Yoshihisa Obayashi (ICRR) ooba at icrr.u-tokyo.ac.jp
Kentaro Komori (MIT) kentarok_at_mit.edu
Our dream is still to get the top download counts in JGWdoc.

x-arm

input

output

KSC Newsletter backnumbers
this issue[JGW-L1910543]
https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=10543
No. 4 (2019/4)[JGW-L1910057]https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=10057
No. 3 (2018/12)[JGW-M1809350]https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=9350
No. 2 (2018/8)[JGW-L1808559] https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=8559
No. 1 (2018/4)[JGW-L1808122] https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=8122
16